What is wrong with my computer?

One day i went to power up, but nothing happened. No POST beeps, no visuals on monitor, but the fans were spinning and the lights were on. Also, the CPU led was red. I tried resetting CMOS but it didn't work. I ended up rma'ing because no trouble shooting worked.

I got it back today and it was good for about 5 boot ups. Everything worked fine in Windows 7. The last time i think i updated bios, then i had to restart and the same problem came up again.

What should i do? What do you think is the problem?

Specs: M5a99x evo asus mobo, gtx 560, cooler master 850watt, phenom x4, 160gb WD, 8gb 1600mhz, sony writer.

Any help/questions/comments would be appreciated!